#!/bin/bash
#
# Proof of concept Wig & Pen package converter
#
# Copyright © 2008  Guillem Jover <guillem@debian.org>
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# Required: gpg, procmail, perl, patchutils
#

set -e

fdsc=$1

echo "Switching $fdsc to Wig&Pen format..."

cp -f $fdsc $fdsc.orig

echo " getting rid of gpg signature..."

if gpg -d $fdsc >$fdsc.asc 2>/dev/null; then
  mv $fdsc.asc $fdsc
fi

echo " extracting information..."

dscfiles=`formail -z -xFiles <$fdsc | cut -d' ' -f4`
pkgdir=`echo "$dscfiles" | sed -n -e 's:_:-:;s:\.orig\.tar\.gz::p'`
fdiff=`echo "$dscfiles" | grep 'diff\.gz$'`
fdebian=`echo $fdiff | sed -e 's:diff:debian.tar:'`

paths="`zcat $fdiff | lsdiff --strip 1 | grep -v '^debian' || true`"
if [ -n "$paths" ]; then
  echo " diff modifies files outside debian/ dir, bailing out."
  exit 1
fi

echo " extracting sources..."

dpkg-source -x $fdsc

echo " remove quilt series file..."

rm -f $pkgdir/debian/patches/series

echo " rename patches to run-parts expected names..."

cd $pkgdir
rename 's:\.patch$::' debian/patches/*
rename 'tr:_\.:-:' debian/patches/*
cd ..

echo " converting $fdiff to $fdebian..."

tar czf $fdebian -C $pkgdir/debian/ .

echo " fixing $fdsc to refer to $fdebian..."

fdebian_size=`stat -c %s $fdebian`
fdebian_md5=`md5sum $fdebian | sed -e "s:  : $fdebian_size :"`

sed -i -e "s:^.* $fdiff$: $fdebian_md5:" $fdsc

echo " fixing $fdsc Format..."

sed -i -e 's/^Format: 1\.0/Format: 2.0/' $fdsc

echo " cleaning up after conversion..."

rm -f "$fdiff"
rm -rf "$pkgdir"

echo "done."